An e-bike brake cut-off sensor detects brake-lever operation so the electrical system can stop motor drive. It is a different specification from the brake that slows the wheel. For an importer or dealer, a quotation saying “hydraulic disc brakes” does not, by itself, document the motor cut-off function.
Short answer: A brake cut-off sensor signals the control system to stop motor drive when braking; the mechanical brake slows the wheel. Hydraulic actuation does not establish whether that electrical function is fitted. Compare four items: the brake assembly, lever and signal hardware, complete-system response, and supporting model instructions. For BG EBIKE orders, identify the function on the quoted configuration and carry that record into sample evaluation and replacement-parts selection.
When comparing complete bikes, keep the brake assembly and its electrical function in separate fields. This makes it easier to compare offers and describe the selected configuration accurately to customers.
What does an e-bike brake sensor do?
TEKTRO’s brake-sensor guide describes its sensor as a switch that cuts motor power when the brake lever is pulled. In the assembly described, lever movement changes the position of a magnet relative to the sensor. That is a documented example, not a description of every e-bike brake system.
In a purchasing record, separate the rider’s brake input, the sensor or switch fitted to the assembly, and the resulting motor response. A component name alone is less useful than a clear description of what the complete supplied system does.
Stopping motor drive should not be presented as a braking-distance claim. A buyer still needs the specification and evaluation of the vehicle’s braking system. The cut-off function does not establish how quickly a particular bike will stop.
Do hydraulic brakes automatically include motor cut-off?
The words “hydraulic brakes” are not enough to establish that feature. Hydraulic describes the brake’s actuation; the electrical switch or sensor is another item to identify. For example, TEKTRO lists its HD-E3120 / E3110 hydraulic brakes with a separate quick-connection power cut-off sensor feature.
Use that distinction when reading a supplier quote. “Dual disc” identifies neither the full actuation specification nor a motor cut-off function. If an electrical feature is not stated, record it as unspecified rather than marking it present or absent.
For the broader distinction between brake layouts and actuation, see our electric bike brake types guide. Here, the task is to identify the additional control function on the quoted build.
Keep four fields in the configuration comparison
Use this short record for each model and order version. It is a purchasing aid, not a wiring diagram or a universal test procedure.
| Field | What to record |
|---|---|
| Brake assembly | Front and rear brake type, actuation and component model where supplied. Keep the brake specification separate from electrical features. |
| Lever and signal hardware | The specified lever, switch or sensor version, and which lever inputs the supplier says are connected. |
| Complete-system response | The stated motor response when braking, including any operating-mode conditions in the applicable instructions. |
| Supporting record | The model-specific specification or manual, its revision, and any outstanding point to resolve during sample evaluation. |
For example, if Offer A says only “hydraulic disc brakes” and Offer B also identifies a power cut-off sensor, the offers differ in documented detail. That does not prove Offer A lacks the feature, or that Offer B has better stopping performance. Ask for the missing system description before ranking them on that basis.
What should a sample review establish?
Ask the supplier to demonstrate the stated function on the identified sample using the manufacturer’s procedure. Keep the sample version, relevant operating conditions and result with the configuration record. If the result differs from the specification, resolve the discrepancy before carrying that claim into the order or sales listing.
A still photograph of a brake lever or cable cannot show the motor’s response. Equally, a demonstration of one sample should remain linked to that build rather than becoming a promise about every catalogue model. Our sample evaluation guide explains how to carry agreed sample details into a bulk order.
If the proposed lever or controller changes, ask whether the documented function and supporting information still apply to the revised configuration. Avoid treating a similar-looking replacement as proof of equivalent operation.
Models to compare
These listed configurations illustrate why mechanical braking and electrical cut-off need separate records. Their brake or motor ratings do not identify the installed sensor logic.
- B70: listed 800 W motor, front and rear disc brakes, and 48 V, 60 V or 72 V 20 Ah configurations. Match service parts to the selected voltage version.
- V15: listed 2,000 W motor, 72 V 32 Ah lithium-ion battery and front and rear disc brakes. Record its lever and controller references independently of the B70.
- Blue U: listed 500 W motor and 60 V lead-acid battery. A shared vehicle category does not make its electrical parts interchangeable with the other two models.
Compare the seated scooter range or electric bike range, then specify the brake-control function for the chosen build.
